The Indianapolis International Airport is not a hub of activity on this Monday afternoon. The rare final call for boarding echoes throughout the terminal, causing no interest from the handful of patrons tucking into buttery pretzels.

It is plausible that the arrival of a professional soccer club would cause a few heads to turn.

But that is not the case. Toronto FC II walk through the terminal and the food court undetected. They have no recognizable star power. Only goalkeeper Caleb Patterson-Sewell’s scruffy, lengthy beard sticks out from the pack. But otherwise, players fit anonymously into long lineups at Chick-Fil-A to drop some of their $60 per diem for the two-day road trip. The food might not be fit for professional athletes, but like so much of life in the United Soccer League, the decision to eat it is born out of necessity.

It is almost 4:30 p.m., but the team is still two hours away from Louisville, Kentucky, their final destination. The next day...